WO2017017437A1 - Suivi de conteneurs - Google Patents

Suivi de conteneurs Download PDF

Info

Publication number
WO2017017437A1
WO2017017437A1 PCT/GB2016/052286 GB2016052286W WO2017017437A1 WO 2017017437 A1 WO2017017437 A1 WO 2017017437A1 GB 2016052286 W GB2016052286 W GB 2016052286W WO 2017017437 A1 WO2017017437 A1 WO 2017017437A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
tag
container
inverted
tracking
Prior art date
Application number
PCT/GB2016/052286
Other languages
English (en)
Inventor
Hilary Charles DAVID
Johnny Nemes
Original Assignee
Inmarsat Global Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Inmarsat Global Limited filed Critical Inmarsat Global Limited
Priority to US15/748,383 priority Critical patent/US10817770B2/en
Priority to KR1020187005312A priority patent/KR102658331B1/ko
Priority to EP16759820.0A priority patent/EP3329427B1/fr
Priority to CN201680044773.7A priority patent/CN108140139B/zh
Priority to ES16759820T priority patent/ES2791986T3/es
Publication of WO2017017437A1 publication Critical patent/WO2017017437A1/fr

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07773—Antenna details
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0723—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips the record carrier comprising an arrangement for non-contact communication, e.g. wireless communication circuits on transponder cards, non-contact smart cards or RFIDs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/06—Waveguide mouths

Definitions

  • This invention relates to an arrangement for F (radio frequency) tracking of a shipping container, such as an intermodal freight container.
  • Shipping containers such as intermodal freight containers, typically comprise standardised reusable rectangular steel boxes varying in length from 8 to 56 feet (2.4 to 17 m) and in height from 8 feet to 9 feet 6 inches (2.4 to 2.9 m), and may comply with ISO 6436.
  • Such containers are widely used for transport of goods across sea and land, and it is therefore desirable to be able to identify individual containers, to track their location and/or to receive status information from them.
  • Patent publication US-A-7414571 discloses a low frequency transmitter tag that exploits near field behaviour in gaps between containers in a stack.
  • an RF tag according to claim 1.
  • a container tracking system according to claim 14.
  • Embodiments of the invention may use the channels created by the container walls when the containers are stacked, to create a propagation environment similar to that of a transmission wave guide. Studies and investigations into RF propagation in the above environments show that, when using the correct propagation methods, the RF radiated path can be enhanced by the container stack.
  • the channels within the container stack act like waveguide to channel RF radiation creating a positive RF radiation environment.
  • the shielded enclosure forms a highly reflective environment for the propagation of radio waves.
  • An electromagnetic wave can potentially propagate very efficiently between the spacing of stacked or adjacent containers under specific conditions.
  • the walls of adjacent containers form a parallel-plate transmission line (or waveguide) where the extent of the walls tends to infinity.
  • the containers have finite dimensions, but these are electrically large compared to the wavelength of practical frequencies ( ⁇ 0.35m at 868 M Hz). Therefore the container walls and the gap can be considered to approximate a parallel-plate transmission line.
  • Parallel-plate transmission lines can support waveguide-type modes (transverse electric - TE, and/or transverse magnetic - TM) if the gap is larger than a half wavelength.
  • waveguide-type modes transverse electric - TE, and/or transverse magnetic - TM
  • typical container spacing is much less than a half wavelength, which rules out the support of TE and TM waves.
  • the spacing between the parallel walls could be much smaller than a half wavelength and still support RF propagation, but only if the transverse electromagnetic (TEM) wave was excited between the parallel container walls.
  • Propagation of the TEM wave requires the electric field component to be perpendicular to the parallel plates (i.e. container walls). Therefore, an RF tag placed between close-spaced container walls should have an antenna that predominantly generates an electric field at right- angles to the container wall.
  • Planar antenna designs parallel to the container wal l e.g. printed loop antenna designs typically used for RFID applications
  • An example of a suitable antenna might be a short monopole perpendicular to the wall.
  • the attenuation constant of a parallel-plate transmission line is low, despite the likely use of steel container walls (steel is a lossy conductor at UHF and microwave frequencies). In other words, the transmission of RF energy between the container walls may be very efficient and may cover a large volume (compartment) within the hold of a container ship.
  • An antenna that can be inserted between close-spaced parallel plates should be relatively compact. Furthermore, to excite a TEM wave between the parallel plates, the antenna should generate significant electric field perpendicular to the parallel plates. Preferably, the antenna should be able to operate effectively both for a single container (i.e. open propagation) or for the parallel-plate scenario (i.e. transmission line) without significant difference in performance caused by detuning.
  • An RF tag placed between adjacent or stacked containers should be low profile. Its footprint may primarily be determined by the circuit board and/or battery dimensions, while its height will be governed by the limited available space (which may be less than or equal to the depth of typical container corrugation).
  • An embodiment of the invention comprises an inverted-L or inverted-F antenna which is tolerant to being placed between parallel plates and which generates a sizeable electric-field component perpendicular to the parallel plates, thereby exciting the desired TEM wave.
  • the electric field component of the TEM wave is oriented at right-angles to the two parallel plates, thus providing efficient propagation of RF energy between adjacent and/or stacked containers.
  • Figures la and lb show respectively a model of an inverted-L antenna and its simulated radiation pattern, in an embodiment of the present invention
  • Figures 2a and 2b show respectively simulated phi and theta components of the electric field generated by the inverted-L antenna in free space.
  • Figure 3 shows the simulated return loss of the inverted-L antenna in free space.
  • Figure 4 shows the simulated return loss of the inverted-L antenna between parallel metal plates.
  • Figure 5 is a schematic diagram of an RF tag incorporating an antenna in an embodiment of the invention.
  • Figure 6 is a schematic diagram of the mounting of the RF tag to the side of a container.
  • Figure 7 is a diagram of a system architecture for use with a plurality of the RF tags.
  • Figures 1 to 4 illustrate the performance of an inverted-L antenna in an embodiment of the invention.
  • Figure la shows the inverted-L antenna 1 comprising a first portion la extending substantially perpendicularly to a ground plane 2 (i.e. in the z direction shown in Figures la and lb), and a second portion lb extending substantially parallel to the ground plane 2 (i.e. in the x direction).
  • the ground plane 2 may comprise a PCB (printed circuit board) for connection of other components to the antenna 1, as described further below.
  • Figure lb shows the simulated radiation pattern of the inverted-L antenna 1.
  • the simulated peak antenna gain is approximately 2.7 dBi.
  • the antenna radiation pattern shown in Figure lb relates to the total electric field strength, which does not provide insight into the antenna polarisation.
  • Figures 2a and 2b show the simulated phi and theta components respectively (spherical coordinates) of the electric field generated by the antenna 1 in free space. From the theta component (shown Figure 2b), there is a sizable electric field component that would be generated perpendicular to the ground plane 2 and therefore suitable for exciting the TEM wave between two parallel plates, parallel to the ground plane 2.
  • Figure 3 shows the simulated return loss for the improved inverted-L antenna.
  • the design shows a very good impedance match to 50 ohms.
  • the bandwidth at 10 dB return loss is approximately 600 MHz, which is large.
  • the PCB may have dimensions 80 x 60 mm (in the x and y directions) and the antenna wire may have dimensions approximately 20 mm vertical (in the z direction) and approximately 12 mm horizontal (in the x direction), with a feedpoint location approximately 12 x 10 mm (in the x and y directions) from the corner.
  • Figure 4 shows the simulated return loss for the inverted-L antenna 1 positioned between parallel plates with a 40 mm separation.
  • the return loss at 2.4 GHz is not as good as compared with that for the antenna design in free space but the match is still adequate.
  • the inverted-L antenna 1 connected to an F source at 2.4 GHz was placed on a non- conductive table for support.
  • a receive antenna with 9.5 dBi gain was connected to a spectrum analyser and positioned 0.5 m from the inverted-L antenna 1.
  • the free-space path loss over 0.5m at 2.4 GHz is 34.0 dB.
  • the inverted-L antenna 1 was rotated in azimuth and the peak power at the receive antenna was measured on the spectrum analyser.
  • the receive antenna was 'peaked up' to measure the highest power level and, therefore, the maximum gain.
  • the receive antenna was also rotated to measure the separate vertically and horizontally polarised components.
  • the Friis transmission formula was used to determine the antenna gain.
  • the measurements results are presented in Table 1 below.
  • the peak measured gain of the inverted-L antenna was 2.5 dBi, which is consistent with the peak simulated gain of 2.7 dBi.
  • the design of an antenna placed between two parallel plates is important because the antenna must excite the TEM wave between the two closely spaced plates.
  • the TEM wave can propagate efficiently with low loss between two parallel plates made of steel.
  • the antenna design described above may be incorporated in an RF tag 7 for mounting on a container, as shown for example in Figures 5 and 6.
  • the RF tag 7 comprises a transceiver 4 connected to the antenna 1, and a processor 6.
  • the transceiver 4 may comprise an integrated circuit (IC), preferably mounted on a PCB forming the ground plane 2. In cases where only unidirectional transmission is required, the transceiver 4 may instead be a transmitter.
  • the processor 6 may comprise a low power microprocessor, preferably also mounted on the PCB.
  • one or more status inputs may be provided to the processor 6, for example to provided status information of the RF tag 7 and/or of a container to which the tag 7 is attached.
  • the processor 6 controls the transceiver 4 to periodically transmit data including the identity of the RF tag 7, event time and message data such as status data.
  • These transmissions may be UNB (ultra narrow band) transmissions comprising at least a tag ID that substantially uniquely identifies the tag, and optionally message data (containing for example the status information mentioned above), event timing data and/or error correction data.
  • the frequency spectra used for these transmissions may be those reserved for RFID communications e.g. 865- 868 M Hz or 2446-2454 M Hz.
  • a power supply (not shown) is also provided, for providing power to the transceiver 4 and the processor 6.
  • the power supply is preferably a battery; this may be rechargeable in order to extend the useable life of the tag, but currently available rechargeable batteries significantly self-discharge within a year.
  • a non-rechargeable battery with a long shelf life such as a lithium metal primary battery, may be used.
  • the RF tag 7 may include a housing 10, as shown Figure 6.
  • the RF tag 7 is self-contained and includes all the required components such as the battery within the housing 10.
  • the RF tag 7 may be fixed to a side wall 12 of a container, so that the antenna 1 will be located in a gap G between parallel walls 12 of adjacent containers, and the ground plane 2 is substantially parallel to the side walls 12.
  • the RF tag 7 may be fixed within a corrugation, to avoid damage.
  • Figure 7 shows an example of a system architecture for container tracking, in which the RF tags 7 may be used.
  • the RF tags 7 transmit data periodically, as described above, to one or more base stations 14, which may be installed within the hold or on the deck of a ship, at a dockside or at a container storage facility, for example.
  • the base stations 14 communicate with a central communication system 16 in the locality of the base stations 14; this is typically done over a wired connection.
  • the central communication system 16 communicates via a satellite terminal 18 and a satellite 20 to a satellite earth station 22, which is in communication with a tracking database 24.
  • the tracking database 24 stores data transmitted by the RF tags, and optionally additional location and/or status data added by other parts of the system, such as the base stations 14 or the central communication system.
  • the tracking database 24 may be queried by a container tracking application 26.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Details Of Aerials (AREA)
  • Waveguide Aerials (AREA)
  • Aerials With Secondary Devices (AREA)

Abstract

L'invention concerne un système de suivi de conteneurs comprenant une pluralité de conteneurs métalliques disposés avec des faces sensiblement parallèles (12) ayant un espace (G) entre elles, et au moins un émetteur RF comprenant une antenne (1) située à l'intérieur de l'espace (G) et conçue pour exciter une onde électromagnétique transversale (TEM) qui est transversale aux faces parallèles (12).
PCT/GB2016/052286 2015-07-30 2016-07-26 Suivi de conteneurs WO2017017437A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US15/748,383 US10817770B2 (en) 2015-07-30 2016-07-26 Container tracking
KR1020187005312A KR102658331B1 (ko) 2015-07-30 2016-07-26 컨테이너 추적
EP16759820.0A EP3329427B1 (fr) 2015-07-30 2016-07-26 Suivi de conteneurs
CN201680044773.7A CN108140139B (zh) 2015-07-30 2016-07-26 集装箱追踪系统
ES16759820T ES2791986T3 (es) 2015-07-30 2016-07-26 Seguimiento de contenedores

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1513450.5 2015-07-30
GB1513450.5A GB2540938B (en) 2015-07-30 2015-07-30 Container tracking

Publications (1)

Publication Number Publication Date
WO2017017437A1 true WO2017017437A1 (fr) 2017-02-02

Family

ID=54062909

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2016/052286 WO2017017437A1 (fr) 2015-07-30 2016-07-26 Suivi de conteneurs

Country Status (7)

Country Link
US (1) US10817770B2 (fr)
EP (1) EP3329427B1 (fr)
KR (1) KR102658331B1 (fr)
CN (1) CN108140139B (fr)
ES (1) ES2791986T3 (fr)
GB (1) GB2540938B (fr)
WO (1) WO2017017437A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018218250A2 (fr) 2017-05-26 2018-11-29 Vibrant Holdings, Llc Composés photoactifs et procédés de détection et de séquençage de biomolécules

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WO2008006947A1 (fr) * 2006-07-13 2008-01-17 Confidex Oy Étiquettes d'identification radiofréquence
US20090045916A1 (en) * 2005-06-30 2009-02-19 Zvi Nitzan Battery-assisted backscatter RFID transponder
US8169322B1 (en) * 2008-11-07 2012-05-01 Iowa State University Research Foundation, Inc. Low profile metal-surface mounted RFID tag antenna
US20120268327A1 (en) * 2007-08-29 2012-10-25 Intelleflex Corporation Inverted f antenna system and rfid device having same

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US7414571B2 (en) 2002-08-19 2008-08-19 Q-Track Corporation Low frequency asset tag tracking system and method
US7339469B2 (en) 2004-11-22 2008-03-04 Maersk Logistics Usa, Inc. Shipping container monitoring and tracking system
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Publication number Priority date Publication date Assignee Title
US20060086809A1 (en) * 2004-06-18 2006-04-27 Symbol Technologies, Inc. Method, system, and apparatus for a radio frequency identification (RFID) waveguide for reading items in a stack
US20090045916A1 (en) * 2005-06-30 2009-02-19 Zvi Nitzan Battery-assisted backscatter RFID transponder
WO2008006947A1 (fr) * 2006-07-13 2008-01-17 Confidex Oy Étiquettes d'identification radiofréquence
US20120268327A1 (en) * 2007-08-29 2012-10-25 Intelleflex Corporation Inverted f antenna system and rfid device having same
US8169322B1 (en) * 2008-11-07 2012-05-01 Iowa State University Research Foundation, Inc. Low profile metal-surface mounted RFID tag antenna

Also Published As

Publication number Publication date
CN108140139B (zh) 2021-03-23
EP3329427B1 (fr) 2020-02-26
KR102658331B1 (ko) 2024-04-18
GB2540938B (en) 2021-02-03
KR20180034540A (ko) 2018-04-04
US20180218250A1 (en) 2018-08-02
GB2540938A (en) 2017-02-08
GB201513450D0 (en) 2015-09-16
US10817770B2 (en) 2020-10-27
EP3329427A1 (fr) 2018-06-06
CN108140139A (zh) 2018-06-08
ES2791986T3 (es) 2020-11-06

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